| 摘要 |
PURPOSE:To require no discharge pump of nitrogen rich air by connecting an discharge passage exhausting the nitrogen rich air of an oxygen density enriching device to a discharge gas passage through a reed valve so as to absorb the nitrogen rich air by use of the pulsating discharge gas. CONSTITUTION:An oxygen density enriching device 12 made by containing an oxygen transparent membrane 14 in a case 13 introduces the air through an air introduction passage 15 branched from an intake air passage 2 downstream an air cleaner 3, and the oxygen rich air transmitted through the oxygen transparent membrane 14 is adequately fed into the intake air passage 2 from a feed passage 16 through a suction pump 18 and a control valve 21. In addition, the nitrogen rich air not transmitted through the transparent membrane 14 is introduced to a discharge passage 17, which is connected to a discharge gas passage 4 through a reed valve 24 so that the nitrogen rich air can be exhausted to the discharge gas passage 4 by utilizing the pulsating discharge gas. The discharge passage 14 is connected to the feed passage 16 downstream the pump 18 through 2 relief passage 25 provided with a relief valve 26. |
